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Rare variable star 49 EP

HR 978

RA 49.1466° · Dec 32.1840° · star

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Score breakdown

· 7 badges
49 pts · Rare
Rare 50 pts → Epic
  • Fades out of naked-eye view +16
  • Naked-eye visible +8
  • Sun-like G-type star +8
  • Variable star +5
  • Subgiant (leaving the main sequence) +5
  • Gently variable +4
  • A named variable star +3
Total score 49

1 more point to reach Epic.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Sun-like G-type star · +8
  • Subgiant (leaving the main sequence) · +5
  • Gently variable · +4
  • Fades out of naked-eye view · +16
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G8IV — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a subgiant, caught in the act of leaving the main sequence as the hydrogen in its core runs out.
  • It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 6 you can see it with your own eyes from a dark site, over in Perseus.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around November — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
0.335
bv
0.988
constellation
Per
dist ly
438.9717
luminosity
63.9735
mag
5.98
name
HR 978
spect
G8IV
var amplitude
0.08
var designation
V573
var max
5.944
var min
6.024

About HR 978

HR 978 is a rare variable star. It lies about 439 light-years from Earth, sits in the constellation Per, shines at apparent magnitude 5.98 and has spectral type G8IV.

Its spectrum reads G8IV — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HR 978 in the constellation Per. At apparent magnitude 5.98, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 978 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why HR 978 is a rare variable star

HR 978 scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, Sun-like G-type star, Subgiant (leaving the main sequence), Gently variable, Fades out of naked-eye view and A named variable star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.